W. Trautmann, J.F. Sharpey-Schafer, H.R. Andrews, B. Haas, O. Haeusser, et al.. Linear polarization of the continuum gamma rays feeding high-spin yrast states in $^{151-152}$Dy and $^{156-158}$Er.
Physical Review Letters, American Physical Society, 1979, 43, pp.991-994.
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